Over the next few months I'm going to be converting my iron 883 to a Hammer Performance 1250cc kit. Now I already have a stage one kit on the bike. Exhaust, air cleaner, and the Vances and Hines FuelPak FP3.

I'm going with just a basic conversion. New cylinders, new pistons, and STOCK 883 heads. I just don't have the money to port my heads and i'm happy with just the basic conversion.

Vance and Hines just released fuel mappings for the Screamin Eagle 1200cc kit. This consists of 1200cc cylinders, and heads made for the 1200. Im thinking I can Put the 1200 mapping on the the 1250cc kit and then auto tune it for the 50cc variance with the kits. Would this be too drastic of a change for an auto tune? What do you guys think.

 

Call Vance and Hines. I'm sure they'll be able to give you the correct answer.